true vertical

The local vertical or the line passing through the observer and the geographical poles of the earth.
True vertical

Aviation dictionary. 2014.

Look at other dictionaries:

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  • true vertical photograph — An aerial photograph taken with the optical axis of the camera perpendicular to the ground. In such a photograph, the principal point, the ground nadir, and the photo nadir coincide. Whereas the principal point is always the geometric center of a …   Aviation dictionary

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  • True polar wander — is a phenomenon in which a planet or moon changes its orientation so that different points become the North and South Poles. This can happen when the two larger moments of inertia are near equal.The Earth is not a true sphere, and therefore has… …   Wikipedia

  • vertical — I (New American Roget s College Thesaurus) Perpendicular to the earth s surface Nouns 1. vertical, perpendicular, upright; verticality, plumbness, aplomb, perpendicularity, orthogonality, elevation, erection; right angle, normal, azimuth circle;… …   English dictionary for students

  • true prime vertical — The vertical circle that intersects the geographical poles and the true east and west points of the horizon, as distinguished from the magnetic, compass, or grid prime vertical through the magnetic, compass, or grid east and west points,… …   Aviation dictionary

  • Vertical tangent — In mathematics, a vertical tangent is tangent line with infinite slope, thus being vertical. Definition Suppose the function fnof; ( x ) hold the point P ( c , fnof; ( c )). The graph of fnof; has a vertical tangent at P if one of the following… …   Wikipedia

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  • True — Synonyms and related words: Christian, absolute, acceptable, accepted, accommodate, accord, accurate, accurately, active, actual, adapt, adjust, adjust to, apodictic, applicable, appropriate, approved, ardent, arrowlike, ascertained, assimilate,… …   Moby Thesaurus

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